If you would like to know how far did Mackenzie run in one hour, you can calculate this using the following steps:
26 1/5 = 131/5 miles ... 5 4/5 = 29/5 hours
x miles = ? ... 1 hour
131/5 * 1 = 29/5 * x
131/5 = 29/5 * x
x = 131/5 * 5/29
x = 131/29
x = 4 15/29 miles
The correct result would be 4 15/29 miles.